1. The problem statement, all variables and given/known data An 16m by 9.0m house is built on a concrete slab 20cm thick. What is the heat-loss rate through the floor if the interior is at 29°C while the ground is at 19°C? Given: Area = 16*9 = 144m^2 DeltaX = 20cm = 0.2m DeltaT = 29-19 = 10°C k = not given H = ? 2. Relevant equations Equation (i believe): H = (-k*A*DeltaT)/DeltaX 3. The attempt at a solution I calculated the heat loss with the above given details but apparently the answer does not depend on the variable k (thermal conductivity). Anyone got any ideas?